Pimch and die for punching watch-hands



UNITED srnrns PATENT OFFICE.

AARON L. DENNI'SON, OF ROXBURY, MASSACHUSTTS.

PUNCH AND DIE FOR PUNCI-IING WATCH-HANDS. s

specification or Letters Patent No.

To all 'whomc' concern.'

Be it known that I, AARON L. DENNIsoN,

of Roxbury, in the county of Norfolk and State of Massachusetts, haveinvented a new and useful Improvement inthe Method of Making Punches ,tobe Used in the Manufaci ture of latch-Hands; and I do hereby de? tweentwo metallic blocks; Fig. 5, is a front elevation of the punch andblocks; Fig. 6, is a plan of the different parts of the punch; and Fig.7, is an elevation of the punch in separate pieces.

To form the parts of my punch for the very delicate operations which ithas to perform, I form a counter die in two parts, as shown at F, Figs.l, 2, and 3, of hardened steel blocks, or their equivalent, screwedtogether with the exact` shape of the hand it is designed to imitate,made between them by removing such portion of their edges as will leavea space of the form intended. The punch to be used with this dieconsists of two similar pieces, H, H; between which inlike manner theshape of the article is to be exactly imitated; for all the circularparts of the punch, `I use pieces 0f round steel wire, drawn their wholelength to the exact figure required; if any other figure is desired thanround, I cause a wire of that figure to be used; for the straight orcurved parts that are long and narrow, I take thin slips of steel also,assuming the exact form of the article to be made throughout their wholedepth, which exactly fits the parts of the blocks H, for whichI they areintended; these pieces being small and of simple elements, of a `uniformthickness throughout, I am enabled to temper them perfectly withoutdangerof warping; they are readily and accurately made, and are sure toalways fit their places without any extra finishing of their Shanks,there is consequently a great saving inthe construction of such minutepieces, and tting them to their'places, as Well as `the facility, ease,4and consequent 2, is a' 11,522, dated August 15, 1854:.

`economy in the reconstruction of the' ent-ire punch, or of thereplacing of any of the delicate parts of the same when they becomebroken or injured, which frequently occurs in such small work as watchhand punching.

When the blocks H, H, have had the pieces of the punch placed betweenthem, they are screwed tightly together, embracing rmly every part ofthe shank of the compound punch, leaving the part that projectssuficiently beyond the face of the blocks, for the purpose intended, andthe blocks are then firmly secured to the lower end of a slide D, in apunching press of any convenient construction, which moves up and downdirectly over t-he die.

There are two guide pins I, I, set in the punch block H, which arefitted to slide up and down in holes, J, J, Fig. 3, in the die block,for thepurpose of keeping the punch and die in their true relation toeach other while in operation. To operate this punch I first place apiece `of thin metal between the -die and punch; the power is thenapplied to the` lever, every elevation of the lever causes a depressionof the slide, forcing the punch through the metal into the die, andtaking out a piece precisely the shape of the punch.

Having thus fully described my invention, what I claim therein as new,and for which I desire to secure Letters Patent, is-

The construction and arrangement of the punch and die in the manner andfor the purposes set forth, the punch being of elementary parts, formedto the same figure, or nearly so, in their cross section throughouttheir whole depth, and braced between blocks or clamps made to thefigure of the article to be formed, by which construction the mostdelicate and complex punch can be formed in a cheap andexpeditiousmanner, and readily renewed or changed; and being throughout of the samemagnitude, are readily and perfectly hardened, without injury, which hasheretofore been found an insuperablel difficulty in punching smalldelicate wor t.

A. L. DENNisoN.

